CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)	1 Months Ended	3 Months Ended		8 Months Ended	9 Months Ended
	Feb. 05, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Operating revenues
Operating revenues	$ 77,481,000	$ 250,371,000	$ 241,836,000	$ 562,147,000	$ 761,065,000
Operating costs and expenses
Depreciation and amortization	20,622,000	25,248,000	90,606,000	64,831,000	283,652,000
General and administrative	5,727,000	14,982,000	15,662,000	47,939,000	106,504,000
Merger and integration costs	0	5,033,000	0	13,786,000	0
Transaction costs on sale of operating assets	0	3,146,000	0	3,146,000	0
Hurricane losses	0	10,441,000	0	10,441,000	0
Pre-petition charges	0	0	3,894,000	0	14,409,000
Loss on impairment	0			0	1,119,517,000
Total operating costs and expenses	76,051,000	263,864,000	260,711,000	638,573,000	2,007,948,000
Operating loss	1,430,000	(13,493,000)	(18,875,000)	(76,426,000)	(1,246,883,000)
Other income (expense)
Interest expense, net of amounts capitalized	(229,000)	(8,870,000)	(23,427,000)	(23,628,000)	(164,586,000)
Gain on bargain purchase	0			64,479,000	0
Gain on extinguishment of debt, net	0	0	17,847,000	0	17,254,000
Interest income and other, net	399,000	973,000	7,872,000	7,490,000	8,546,000
Reorganization items, net	252,051,000	0	(9,014,000)	0	(9,014,000)
Loss before income taxes	253,651,000	(21,390,000)	(25,597,000)	(28,085,000)	(1,394,683,000)
Income tax benefit (provision)	(3,423,000)	(2,275,000)	(25,271,000)	6,631,000	238,944,000
Net loss	$ 250,228,000	$ (23,665,000)	$ (50,868,000)	$ (21,454,000)	$ (1,155,739,000)
Basic:
Net loss (in usd per share)	$ 1.00	$ (0.36)	$ (0.20)	$ (0.35)	$ (4.61)
Diluted:
Net loss (in usd per share)	$ 0.98	$ (0.36)	$ (0.20)	$ (0.35)	$ (4.61)
Contract drilling services
Operating revenues
Operating revenues	$ 74,051,000	$ 231,154,000	$ 227,050,000	$ 515,680,000	$ 714,555,000
Operating costs and expenses
Cost of services	46,965,000	188,552,000	137,180,000	456,853,000	442,479,000
Reimbursables and other
Operating revenues
Operating revenues	3,430,000	19,217,000	14,786,000	46,467,000	46,510,000
Operating costs and expenses
Cost of services	2,737,000	16,462,000	13,369,000	41,577,000	41,387,000
Noble Finance Company
Operating revenues
Operating revenues	77,481,000	250,371,000	241,836,000	562,147,000	761,065,000
Operating costs and expenses
Depreciation and amortization	20,631,000	25,241,000	90,236,000	64,814,000	282,385,000
General and administrative	5,729,000	7,772,000	6,503,000	26,690,000	30,806,000
Merger and integration costs	0	4,149,000	0	7,099,000	0
Transaction costs on sale of operating assets	0	2,230,000	0	2,230,000	0
Hurricane losses	0	10,441,000	0	10,441,000	0
Loss on impairment	0			0	1,119,517,000
Total operating costs and expenses	75,800,000	254,181,000	247,083,000	607,975,000	1,915,580,000
Operating loss	1,681,000	(3,810,000)	(5,247,000)	(45,828,000)	(1,154,515,000)
Other income (expense)
Interest expense, net of amounts capitalized	(229,000)	(8,870,000)	(23,427,000)	(23,628,000)	(164,586,000)
Gain on extinguishment of debt, net	0	0	17,847,000	0	17,254,000
Interest income and other, net	400,000	975,000	7,871,000	7,489,000	8,536,000
Reorganization items, net	195,395,000	0	(49,974,000)	0	(49,974,000)
Loss before income taxes	197,247,000	(11,705,000)	(52,930,000)	(61,967,000)	(1,343,285,000)
Income tax benefit (provision)	(3,422,000)	(2,275,000)	(25,272,000)	6,631,000	238,944,000
Net loss	193,825,000	(13,980,000)	(78,202,000)	(55,336,000)	(1,104,341,000)
Noble Finance Company | Contract drilling services
Operating revenues
Operating revenues	74,051,000	231,154,000	227,050,000	515,680,000	714,555,000
Operating costs and expenses
Cost of services	46,703,000	187,886,000	136,975,000	455,124,000	441,485,000
Noble Finance Company | Reimbursables and other
Operating revenues
Operating revenues	3,430,000	19,217,000	14,786,000	46,467,000	46,510,000
Operating costs and expenses
Cost of services	$ 2,737,000	$ 16,462,000	$ 13,369,000	$ 41,577,000	$ 41,387,000